/* NOTICE:
 * This file was modified by Inception Mobile, Inc. in 2013. The details of the
 * modifications are documented below, as well as in the MODIFICATIONS file.
 *
 * August 11, 2013:
 *     Added checks for _DARWIN_C_SOURCE.
 *     Removed kernel-specific code.
 */

/*  $FreeBSD: src/sys/netinet6/in6.h,v 1.7.2.4 2001/07/04 09:45:23 ume Exp $  */
/*  $KAME: in6.h,v 1.89 2001/05/27 13:28:35 itojun Exp $  */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1982, 1986, 1990, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the University of
 *  California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *  @(#)in.h  8.3 (Berkeley) 1/3/94
 */

#ifndef __KAME_NETINET_IN_H_INCLUDED_
#error "do not include netinet6/in6.h directly, include netinet/in.h.  see RFC2553"
#endif

#ifndef _NETINET6_IN6_H_
#define _NETINET6_IN6_H_
#include <sys/appleapiopts.h>
#include <sys/_types.h>


#ifndef _SA_FAMILY_T
#define _SA_FAMILY_T
typedef __uint8_t   sa_family_t;
#endif

/*
 * Identification of the network protocol stack
 * for *BSD-current/release: http://www.kame.net/dev/cvsweb.cgi/kame/COVERAGE
 * has the table of implementation/integration differences.
 */
#define __KAME__
#define __KAME_VERSION    "20010528/apple-darwin"

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
/*
 * Local port number conventions:
 *
 * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
 * unless a kernel is compiled with IPNOPRIVPORTS defined.
 *
 * When a user does a bind(2) or connect(2) with a port number of zero,
 * a non-conflicting local port address is chosen.
 *
 * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
 * that is settable by sysctl(3); net.inet.ip.anonportmin and
 * net.inet.ip.anonportmax respectively.
 *
 * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
 * default assignment range.
 *
 * The value IP_PORTRANGE_DEFAULT causes the default behavior.
 *
 * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
 * and exists only for FreeBSD compatibility purposes.
 *
 * The value IP_PORTRANGE_LOW changes the range to the "low" are
 * that is (by convention) restricted to privileged processes.
 * This convention is based on "vouchsafe" principles only.
 * It is only secure if you trust the remote host to restrict these ports.
 * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
 */

#define IPV6PORT_RESERVED 1024
#define IPV6PORT_ANONMIN  49152
#define IPV6PORT_ANONMAX  65535
#define IPV6PORT_RESERVEDMIN  600
#define IPV6PORT_RESERVEDMAX  (IPV6PORT_RESERVED-1)
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */

/*
 * IPv6 address
 */
#ifndef WINOBJC     // Defined by ws2tcpip.h
struct in6_addr {
  union {
    __uint8_t   __u6_addr8[16];
    __uint16_t  __u6_addr16[8];
    __uint32_t  __u6_addr32[4];
  } __u6_addr;      /* 128-bit IP6 address */
};
#endif

#define s6_addr   __u6_addr.__u6_addr8

#define INET6_ADDRSTRLEN  46

/*
 * Socket address for IPv6
 */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define SIN6_LEN
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */
#ifndef WINOBJC     // Defined by ws2tcpip.h
struct sockaddr_in6 {
  __uint8_t sin6_len; /* length of this struct(sa_family_t)*/
  sa_family_t sin6_family;  /* AF_INET6 (sa_family_t) */
  in_port_t sin6_port;  /* Transport layer port # (in_port_t)*/
  __uint32_t  sin6_flowinfo;  /* IP6 flow information */
  struct in6_addr sin6_addr;  /* IP6 address */
  __uint32_t  sin6_scope_id;  /* scope zone index */
};
#endif

/*
 * Definition of some useful macros to handle IP6 addresses
 */
#define IN6ADDR_ANY_INIT \
  {{{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }}}
#define IN6ADDR_LOOPBACK_INIT \
  {{{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define IN6ADDR_NODELOCAL_ALLNODES_INIT \
  {{{ 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
#define IN6ADDR_LINKLOCAL_ALLNODES_INIT \
  {{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
#define IN6ADDR_LINKLOCAL_ALLROUTERS_INIT \
  {{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 }}}
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */

extern const struct in6_addr in6addr_any;
extern const struct in6_addr in6addr_loopback;
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
extern const struct in6_addr in6addr_nodelocal_allnodes;
extern const struct in6_addr in6addr_linklocal_allnodes;
extern const struct in6_addr in6addr_linklocal_allrouters;
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */

/*
 * Equality
 * NOTE: Some of kernel programming environment (for example, openbsd/sparc)
 * does not supply memcmp().  For userland memcmp() is preferred as it is
 * in ANSI standard.
 */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define IN6_ARE_ADDR_EQUAL(a, b)      \
    (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */

/*
 * Unspecified
 */
#define IN6_IS_ADDR_UNSPECIFIED(a)  \
  ((*(const __uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[8]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[12]) == 0))

/*
 * Loopback
 */
#define IN6_IS_ADDR_LOOPBACK(a)   \
  ((*(const __uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[8]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[12]) == ntohl(1)))

/*
 * IPv4 compatible
 */
#define IN6_IS_ADDR_V4COMPAT(a)   \
  ((*(const __uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[8]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[12]) != 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[12]) != ntohl(1)))

/*
 * Mapped
 */
#define IN6_IS_ADDR_V4MAPPED(a)         \
  ((*(const __uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
   (*(const __uint32_t *)(const void *)(&(a)->s6_addr[8]) == ntohl(0x0000ffff)))

/*
 * KAME Scope Values
 */
#define __IPV6_ADDR_SCOPE_NODELOCAL 0x01
#define __IPV6_ADDR_SCOPE_LINKLOCAL 0x02
#define __IPV6_ADDR_SCOPE_SITELOCAL 0x05
#define __IPV6_ADDR_SCOPE_ORGLOCAL  0x08  /* just used in this file */
#define __IPV6_ADDR_SCOPE_GLOBAL  0x0e

/*
 * Unicast Scope
 * Note that we must check topmost 10 bits only, not 16 bits (see RFC2373).
 */
#define IN6_IS_ADDR_LINKLOCAL(a)  \
  (((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0x80))
#define IN6_IS_ADDR_SITELOCAL(a)  \
  (((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0xc0))

/*
 * Multicast
 */
#define IN6_IS_ADDR_MULTICAST(a)  ((a)->s6_addr[0] == 0xff)

#define __IPV6_ADDR_MC_SCOPE(a)   ((a)->s6_addr[1] & 0x0f)

/*
 * Multicast Scope
 */
#define IN6_IS_ADDR_MC_NODELOCAL(a) \
  (IN6_IS_ADDR_MULTICAST(a) &&  \
   (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_NODELOCAL))
#define IN6_IS_ADDR_MC_LINKLOCAL(a) \
  (IN6_IS_ADDR_MULTICAST(a) &&  \
   (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_LINKLOCAL))
#define IN6_IS_ADDR_MC_SITELOCAL(a) \
  (IN6_IS_ADDR_MULTICAST(a) &&  \
   (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_SITELOCAL))
#define IN6_IS_ADDR_MC_ORGLOCAL(a)  \
  (IN6_IS_ADDR_MULTICAST(a) &&  \
   (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_ORGLOCAL))
#define IN6_IS_ADDR_MC_GLOBAL(a)  \
  (IN6_IS_ADDR_MULTICAST(a) &&  \
   (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_GLOBAL))

/*
 * IP6 route structure
 */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#ifdef PRIVATE
struct route_in6 {
  struct  rtentry *ro_rt;
  struct  sockaddr_in6 ro_dst;
};
#endif /* PRIVATE */
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */

/*
 * Options for use with [gs]etsockopt at the IPV6 level.
 * First word of comment is data type; bool is stored in int.
 */
/* no hdrincl */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#if 0 /* the followings are relic in IPv4 and hence are disabled */
#define IPV6_OPTIONS    1  /* buf/ip6_opts; set/get IP6 options */
#define IPV6_RECVOPTS   5  /* bool; receive all IP6 opts w/dgram */
#define IPV6_RECVRETOPTS  6  /* bool; receive IP6 opts for response */
#define IPV6_RECVDSTADDR  7  /* bool; receive IP6 dst addr w/dgram */
#define IPV6_RETOPTS    8  /* ip6_opts; set/get IP6 options */
#endif /* 0 */
#define IPV6_SOCKOPT_RESERVED1  3  /* reserved for future use */
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */
#define IPV6_UNICAST_HOPS 4  /* int; IP6 hops */
#define IPV6_MULTICAST_IF 9  /* __uint8_t; set/get IP6 multicast i/f  */
#define IPV6_MULTICAST_HOPS 10 /* __uint8_t; set/get IP6 multicast hops */
#define IPV6_MULTICAST_LOOP 11 /* __uint8_t; set/get IP6 mcast loopback */
#define IPV6_JOIN_GROUP   12 /* ip6_mreq; join a group membership */
#define IPV6_LEAVE_GROUP  13 /* ip6_mreq; leave a group membership */

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define IPV6_PORTRANGE    14 /* int; range to choose for unspec port */
#define ICMP6_FILTER    18 /* icmp6_filter; icmp6 filter */
/* RFC2292 options */
#define IPV6_PKTINFO    19 /* bool; send/recv if, src/dst addr */
#define IPV6_HOPLIMIT   20 /* bool; hop limit */
#define IPV6_NEXTHOP    21 /* bool; next hop addr */
#define IPV6_HOPOPTS    22 /* bool; hop-by-hop option */
#define IPV6_DSTOPTS    23 /* bool; destination option */
#define IPV6_RTHDR    24 /* bool; routing header */
#define IPV6_PKTOPTIONS   25 /* buf/cmsghdr; set/get IPv6 options */

#define IPV6_CHECKSUM   26 /* int; checksum offset for raw socket */
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */
#define IPV6_V6ONLY   27 /* bool; only bind INET6 at wildcard bind */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define IPV6_BINDV6ONLY   IPV6_V6ONLY


#if 1 /*IPSEC*/
#define IPV6_IPSEC_POLICY 28 /* struct; get/set security policy */
#endif /* 1 */
#define IPV6_FAITH    29 /* bool; accept FAITH'ed connections */

#if 1 /*IPV6FIREWALL*/
#define IPV6_FW_ADD   30 /* add a firewall rule to chain */
#define IPV6_FW_DEL   31 /* delete a firewall rule from chain */
#define IPV6_FW_FLUSH   32 /* flush firewall rule chain */
#define IPV6_FW_ZERO    33 /* clear single/all firewall counter(s) */
#define IPV6_FW_GET   34 /* get entire firewall rule chain */
#endif /* 1 */

/* to define items, should talk with KAME guys first, for *BSD compatibility */

#define IPV6_RTHDR_LOOSE     0 /* this hop need not be a neighbor. XXX old spec */
#define IPV6_RTHDR_STRICT    1 /* this hop must be a neighbor. XXX old spec */
#define IPV6_RTHDR_TYPE_0    0 /* IPv6 routing header type 0 */

/*
 * Defaults and limits for options
 */
#define IPV6_DEFAULT_MULTICAST_HOPS 1 /* normally limit m'casts to 1 hop  */
#define IPV6_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member  */

/*
 * Argument structure for IPV6_JOIN_GROUP and IPV6_LEAVE_GROUP.
 */
#ifndef WINOBJC     // Defined by ws2tcpip.h
struct ipv6_mreq {
  struct in6_addr ipv6mr_multiaddr;
  unsigned int  ipv6mr_interface;
};

/*
 * IPV6_PKTINFO: Packet information(RFC2292 sec 5)
 */
struct in6_pktinfo {
  struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
  unsigned int  ipi6_ifindex; /* send/recv interface index */
};
#endif

/*
 * Argument for IPV6_PORTRANGE:
 * - which range to search when port is unspecified at bind() or connect()
 */
#define IPV6_PORTRANGE_DEFAULT  0 /* default range */
#define IPV6_PORTRANGE_HIGH 1 /* "high" - request firewall bypass */
#define IPV6_PORTRANGE_LOW  2 /* "low" - vouchsafe security */

/*
 * Definitions for inet6 sysctl operations.
 *
 * Third level is protocol number.
 * Fourth level is desired variable within that protocol.
 */
#define IPV6PROTO_MAXID (IPPROTO_PIM + 1) /* don't list to IPV6PROTO_MAX */

/*
 * Names for IP sysctl objects
 */
#define IPV6CTL_FORWARDING  1 /* act as router */
#define IPV6CTL_SENDREDIRECTS 2 /* may send redirects when forwarding*/
#define IPV6CTL_DEFHLIM   3 /* default Hop-Limit */
#ifdef notyet
#define IPV6CTL_DEFMTU    4 /* default MTU */
#endif
#define IPV6CTL_FORWSRCRT 5 /* forward source-routed dgrams */
#define IPV6CTL_STATS   6 /* stats */
#define IPV6CTL_MRTSTATS  7 /* multicast forwarding stats */
#define IPV6CTL_MRTPROTO  8 /* multicast routing protocol */
#define IPV6CTL_MAXFRAGPACKETS  9 /* max packets reassembly queue */
#define IPV6CTL_SOURCECHECK 10  /* verify source route and intf */
#define IPV6CTL_SOURCECHECK_LOGINT 11 /* minimume logging interval */
#define IPV6CTL_ACCEPT_RTADV  12
#define IPV6CTL_KEEPFAITH 13
#define IPV6CTL_LOG_INTERVAL  14
#define IPV6CTL_HDRNESTLIMIT  15
#define IPV6CTL_DAD_COUNT 16
#define IPV6CTL_AUTO_FLOWLABEL  17
#define IPV6CTL_DEFMCASTHLIM  18
#define IPV6CTL_GIF_HLIM  19  /* default HLIM for gif encap packet */
#define IPV6CTL_KAME_VERSION  20
#define IPV6CTL_USE_DEPRECATED  21  /* use deprecated addr (RFC2462 5.5.4) */
#define IPV6CTL_RR_PRUNE  22  /* walk timer for router renumbering */
#if 0 /*obsolete*/
#define IPV6CTL_MAPPED_ADDR 23
#endif
#define IPV6CTL_V6ONLY    24
#define IPV6CTL_RTEXPIRE  25  /* cloned route expiration time */
#define IPV6CTL_RTMINEXPIRE 26  /* min value for expiration time */
#define IPV6CTL_RTMAXCACHE  27  /* trigger level for dynamic expire */

#define IPV6CTL_USETEMPADDR 32  /* use temporary addresses (RFC3041) */
#define IPV6CTL_TEMPPLTIME  33  /* preferred lifetime for tmpaddrs */
#define IPV6CTL_TEMPVLTIME  34  /* valid lifetime for tmpaddrs */
#define IPV6CTL_AUTO_LINKLOCAL  35  /* automatic link-local addr assign */
#define IPV6CTL_RIP6STATS 36  /* raw_ip6 stats */

#define IPV6CTL_MAXFRAGS        41      /* max fragments */

/* New entries should be added here from current IPV6CTL_MAXID value. */
/* to define items, should talk with KAME guys first, for *BSD compatibility */
#define IPV6CTL_MAXID   42

__BEGIN_DECLS
struct cmsghdr;

extern int inet6_option_space(int);
extern int inet6_option_init(void *, struct cmsghdr **, int);
extern int inet6_option_append(struct cmsghdr *, const __uint8_t *,
  int, int);
extern __uint8_t *inet6_option_alloc(struct cmsghdr *, int, int, int);
extern int inet6_option_next(const struct cmsghdr *, __uint8_t **);
extern int inet6_option_find(const struct cmsghdr *, __uint8_t **, int);

extern size_t inet6_rthdr_space(int, int);
extern struct cmsghdr *inet6_rthdr_init(void *, int);
extern int inet6_rthdr_add(struct cmsghdr *, const struct in6_addr *,
    unsigned int);
extern int inet6_rthdr_lasthop(struct cmsghdr *, unsigned int);
#if 0 /* not implemented yet */
extern int inet6_rthdr_reverse(const struct cmsghdr *, struct cmsghdr *);
#endif
extern int inet6_rthdr_segments(const struct cmsghdr *);
extern struct in6_addr *inet6_rthdr_getaddr(struct cmsghdr *, int);
extern int inet6_rthdr_getflags(const struct cmsghdr *, int);

extern int inet6_opt_init(void *, size_t);
extern int inet6_opt_append(void *, size_t, int, __uint8_t,
         size_t, __uint8_t, void **);
extern int inet6_opt_finish(void *, size_t, int);
extern int inet6_opt_set_val(void *, size_t, void *, int);

extern int inet6_opt_next(void *, size_t, int, __uint8_t *,
             size_t *, void **);
extern int inet6_opt_find(void *, size_t, int, __uint8_t,
        size_t *, void **);
extern int inet6_opt_get_val(void *, size_t, void *, int);
extern size_t inet6_rth_space(int, int);
extern void *inet6_rth_init(void *, int, int, int);
extern int inet6_rth_add(void *, const struct in6_addr *);
extern int inet6_rth_reverse(const void *, void *);
extern int inet6_rth_segments(const void *);
extern struct in6_addr *inet6_rth_getaddr(const void *, int);
__END_DECLS
#endif /* !_POSIX_C_SOURCE || _DARWIN_C_SOURCE */
#endif /* !_NETINET6_IN6_H_ */
